S
M
T
W
T
F
S
30
85°
67°
31
83°
66°
1
82°
66°
2
83°
65°
3
84°
66°
4
83°
66°
5
83°
67°
6
84°
68°
7
85°
67°
8
82°
67°
9
81°
66°
10
82°
66°
11
81°
67°
12
81°
67°
13
83°
68°
14
85°
68°
15
84°
67°
16
82°
64°
17
83°
65°
18
81°
67°
19
82°
64°
20
79°
65°
21
Hist. Avg.
81°
63°
22
Hist. Avg.
81°
63°
23
Hist. Avg.
80°
63°
24
Hist. Avg.
80°
62°
25
Hist. Avg.
80°
62°
26
Hist. Avg.
80°
62°
27
Hist. Avg.
80°
62°
28
Hist. Avg.
80°
62°
29
Hist. Avg.
80°
62°
30
Hist. Avg.
80°
61°
1
Hist. Avg.
79°
61°
2
Hist. Avg.
79°
61°
3
Hist. Avg.
79°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Serra Mesa
Serra Mesa's September 2026 forecast shows daily high temperatures ranging from 79° to 85°, with overnight lows between 64° and 68°. The average high for September is 83° with an average low of 66°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Serra Mesa. See also: October | November | December.
